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FIGURE 5: Isotopic composition of ∂ 15 N vs. ∂ 18 O of nitrate in the water samples from
the vadose zone underlying organic (Org) and conventional (Con) greenhouses with
respect to typical values in common N sources (VSMOWrefers to Vienna Standard Mean
OceanWater).
14.3.4 RESULTS VALIDATION
To validate the representativeness of the results that were obtained by the
VMS a sediment sampling campaign that included three boreholes to the
upper vadose zone was carried in each greenhouse. Note that while the
VMS collects the sediment mobile pore water, the sediment sample extract
provides the entire solute capacity of the sediment, which includes both
the mobile and immobile phases (Rimon et al., 2011a). Comparing nitrate
 
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